TM221CE40T Logic Controller 40 I/O Transistor Schneider Electric

TM221CE40T – 24V DC PLC with Transistor PNP Outputs and Motion Capabilities

Product Introduction

The TM221CE40T belongs to the Modicon M221 series from Schneider Electric. This logic controller operates on a 24 V DC supply and delivers 40 I/O points with transistor outputs. Unlike relay models, this version uses PNP (source) transistor outputs, which switch faster and endure more cycles. It serves applications like positioning, PWM control, high-speed counting, and small motion systems. The built-in Ethernet port supports Modbus TCP, while the two fast outputs provide 100 kHz PWM/Pulse generation. Additionally, the controller accepts up to 7 expansion modules, so you can grow the system as your needs evolve.

Technical Specifications

Power Supply and Inputs

The TM221CE40T runs on a 24 V DC supply with a range of 19.2 to 28.8 V. It consumes up to 17 W and draws a maximum inrush current of 35 A. For discrete inputs, the unit offers 24 points that comply with IEC 61131-2 Type 1. These inputs support both sink and source wiring at 24 V DC. Among them, 4 inputs are fast, achieving response times of just 5 µs. The controller also includes 2 analog inputs with a 0...10 V range and 10-bit resolution. Conversion time reaches 1 ms per channel plus one scan cycle, with accuracy within ±1% of full scale.

Output Characteristics

This model features 16 transistor outputs with PNP (positive) logic. The outputs deliver 24 V DC at 0.5 A per channel. Two of these outputs, Q0 and Q1, are fast outputs that support PWM (Pulse Width Modulation) and PLS (Pulse) functions up to 100 kHz. This capability makes the TM221CE40T ideal for motor speed control, stepper driver pulsing, and simple positioning tasks. The remaining outputs (Q2...Q15) switch at 0.1 kHz. Each output includes overload and short-circuit protection at 1.3 A with automatic reset. Voltage drop stays below 1 V, and leakage current is only 0.1 mA. Mechanical durability exceeds 20 million cycles, far outlasting relay-based solutions.

Communication and Connectivity

The controller provides three communication ports. First, an Ethernet RJ45 port supports 10BASE-T/100BASE-TX with Modbus TCP server/client and DHCP. Second, a non-isolated serial link (RS232/RS485) handles Modbus RTU/ASCII. Third, a USB mini B port offers fast programming at 480 Mbit/s. These options allow seamless connection to HMIs, drives, SCADA, and programming software. Furthermore, an SD card slot (2 GB max) supports data logging and program backup, adding convenience for field maintenance.

Memory, Performance, and Motion Functions

The controller stores programs in 256 kB of flash memory, handling up to 10,000 instructions. Execution time runs 0.3 ms per 1,000 instructions for periodic tasks, with Boolean instructions at 0.2 µs. The real-time clock drifts ≤30 s/month at 25 °C. For control loops, the unit supports up to 14 simultaneous PID regulators. Specifically for motion, the 2 fast outputs (Q0/Q1) generate PWM or pulse signals at 100 kHz. Together with the 4 fast counting inputs (HSC mode), you can implement closed-loop positioning, encoder feedback, and speed regulation without extra modules.

Mechanical and Environmental Specifications

Dimensions and Mounting

The TM221CE40T measures 160 mm wide, 70 mm high, and 70 mm deep. It weighs 0.456 kg. You can mount it on a DIN rail (TH35-7.5 or TH35-15) or secure it to a panel using the optional fixing kit. Its compact footprint leaves room for additional expansion modules inside the cabinet.

Environmental Ratings

Operating temperature ranges from -10...55 °C for horizontal mounting, or -10...35 °C for vertical installation. Storage temperature spans -25...70 °C. Humidity tolerance is 10...95% without condensation. With the protective cover fitted, the unit achieves an IP20 rating. Vibration resistance reaches 3.5 mm (5...8.4 Hz) and 3 gn (8.4...150 Hz). Shock resistance is higher than relay models at 15 gn for 11 ms, making this transistor version more robust in mechanically harsh environments.

Electrical Immunity

The TM221CE40T complies with EN/IEC 61131-2 and EN/IEC 61010-2-201 standards. It withstands ESD up to 8 kV in air and 4 kV on contact. Fast transients up to 2 kV on power lines are tolerated. Surge immunity reaches 2 kV common mode on AC power lines and 1 kV common mode on DC power lines. Radiated and conducted emissions meet EN/IEC 55011 Class A limits. These certifications ensure stable operation even near variable frequency drives or welding equipment.

Installation and Wiring Guide

Mounting Instructions

First, select a clean, flat surface within your control panel. For DIN rail mounting, snap the controller onto the rail until you hear a click. Verify the rail conforms to IEC 60715 (TH35-7.5 or TH35-15). For panel mounting, use the optional fixing kit. Maintain at least 50 mm clearance above and below for proper airflow. Keep the unit away from high-voltage or high-temperature components.

Wiring Recommendations

Transistor outputs require careful wiring. Use shielded cables for fast outputs (Q0, Q1) and keep lengths under 3 m to preserve signal integrity. For standard outputs, unshielded cables up to 30 m work fine. For fast inputs, use shielded cables under 10 m; standard inputs accept unshielded cables up to 30 m. The screw terminal blocks are removable for pre-wiring convenience. Connect the 24 V DC power supply (19.2...28.8 V) to the 3-terminal block. The sensor supply provides 24 V DC at 250 mA for external devices.

Grounding and Noise Suppression

Proper grounding is critical for transistor circuits. Connect the protective earth terminal to the panel ground with a low-impedance connection. Separate analog input wiring from digital and power lines to avoid interference. For fast outputs driving inductive loads (e.g., small relays or solenoids), add a flyback diode across the load to suppress voltage spikes. Tie cable shields at the controller end only to prevent ground loops.

Packaging List

When you receive the TM221CE40T, the package includes the following items:

• 1 x TM221CE40T logic controller unit

• 1 x removable screw terminal block for inputs

• 1 x removable screw terminal block for outputs

• 1 x 3‑terminal block for 24 V DC power connection

• 1 x 4‑terminal block for analog inputs

• 1 x protective cover (pre-installed)

• 1 x quick start guide (printed)

Note: The SD card, programming cable (USB mini B), and DIN rail mounting accessories are sold separately. For shipping, we use FedEx, UPS, or DHL depending on your region.

Frequently Asked Questions (FAQ)

1. What is the main difference between TM221CE40T and TM221CE40R?
The TM221CE40T uses transistor outputs (PNP, 24 V DC, 0.5 A) and includes 2 fast outputs for PWM/Pulse at 100 kHz. The TM221CE40R uses relay outputs (5...250 V AC / 5...125 V DC, 2 A) and lacks fast PWM outputs. Choose the T version for high-speed switching and motion control; choose the R version for mixed AC/DC loads and higher current.

2. Can I use the fast outputs to drive a stepper motor driver?
Yes. The Q0 and Q1 fast outputs generate pulse signals up to 100 kHz, which directly drive most stepper or servo drivers that accept step/direction inputs. You can also use PWM for speed control of DC motors.

3. Does this controller support expansion modules?
Yes. You can connect up to 7 expansion modules. For transistor output models like this one, the system supports up to 60 additional discrete outputs (relay type) or more transistor I/O depending on the modules chosen.

4. What happens if a transistor output is short-circuited?
Each output includes built-in overload and short-circuit protection at 1.3 A. The protection trips and automatically resets after 1 second. This prevents damage to the controller during wiring faults.

5. What software do I need to program this PLC?
Use EcoStruxure Machine Expert – Basic (formerly SoMachine Basic). This free software supports the entire M221 series and offers ladder logic, function block diagram, and instruction list programming.